A test method for a luffing winch of a crane

Abstract

The application provides a marine hoist testing method, which controls the on-off and regulation of the one-way speed regulating valve through the ball valve 1, the ball valve 3, and the LWA interface, the LWB interface, the LT interface and the LEP interface connected with the multi-way valve group 3, and then tests whether the control oil circuit of the luffing winch can normally drive the luffing winch to rotate and whether the brake oil circuit can normally realize braking when the steel wire rope is driven to rise or fall, so that the luffing winch can safely and efficiently operate, and safety accidents in the formal operation lifting process are avoided. The application can ensure that the luffing winch can safely and efficiently operate, and safety accidents in the formal operation lifting process are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hoisting cranes, in particular to a testing method of a luffing winch for a crane. BACKGROUND

[0002] Nowadays, with the continuous development of marine economy, the prosperity of marine economy is more and more closely related to the development and application of marine hoisting cranes, which promotes the continuous development and utilization of marine resources, so that the demand for marine hoisting cranes will continue to grow and be continuously applied in the fields of offshore platform construction, marine transportation, offshore operation, etc. For example, on the offshore platform, it is used for loading and unloading goods and lifting personnel to the platform, and is one of the most important production and safety equipment in offshore oil production, which has the characteristics of large hoisting capacity, convenient operation, impact resistance, good braking performance, safety and reliability, etc. In the application of offshore engineering projects, the hoisting crane is responsible for the lifting and unloading task of the equipment; in the offshore environment, it is used for cargo transportation and transfer between ships, offshore supply, delivery and recovery of underwater operation equipment, etc.

[0003] Before the hoisting crane uses the luffing winch to work, it needs to be debugged. The purpose of debugging is to check whether the performance of the control oil circuit and the brake oil circuit connected with the luffing winch is good, and whether the valve in the control oil circuit and the brake oil circuit is running normally, so as to ensure that the luffing winch can safely realize efficient operation and avoid safety accidents in the formal operation hoisting process. SUMMARY

[0004] The purpose of the present application is to provide a testing method of a luffing winch for a crane, which can ensure that the luffing winch can safely realize efficient operation and avoid safety accidents in the formal operation hoisting process.

[0005] To achieve the above purpose, the present application provides a testing method of a luffing winch for a crane,

[0006] The luffing winch is set to an empty state, the external interfaces of the luffing winch are connected with a multi-way valve group, the external interfaces include LWA interface, LWB interface, LT interface and LEP interface, the multi-way valve group is connected with an oil tank through a variable hydraulic pump, and the method further comprises the following steps:

[0007] S1. Before starting the luffing winch, the valve in the control oil circuit and the brake oil circuit of the luffing winch is checked, and then the process of the luffing winch driving the steel wire rope to rise and the process of the luffing winch driving the steel wire rope to descend are tested,

[0008] S1.1. The process of the luffing winch driving the steel wire rope to rise includes S1.1.1-S1.1.4,

[0009] S1.1.1 Close the LT interface in the multi-way valve group and ball valve one and ball valve two connected with the LEP interface, open the LWA interface, the LWB interface and the LEP interface, so that the hydraulic oil flows from the LWA interface into the three-way interface, and then flows into the motor and shuttle valve respectively after passing through the three-way interface, the hydraulic oil pushes the shuttle valve to move left and then flows to the reversing valve for reversing, and after reversing, the hydraulic oil flowing from the LEP interface flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released;

[0010] S1.1.2 Open ball valve three, the hydraulic oil flows through the motor and then flows back to the multi-way valve group from the LWB interface through ball valve three, and finally flows back to the oil tank;

[0011] S1.1.3 Change the hydraulic oil flow entering the LWA interface through the variable hydraulic pump, and then observe whether the rotation speed of the luffing winch changes with the change of the hydraulic oil flow;

[0012] S1.1.4 Close the LEP interface, and open the LT interface at the same time, so that the hydraulic oil flows out from the luffing winch brake, then flows to the LT interface through the reversing valve into the multi-way valve group, and finally flows back to the oil tank, and observe whether the rotation of the luffing winch gradually slows down to stop;

[0013] S1.2 Test the process of the luffing winch driving the steel wire rope to descend;

[0014] S2 Disconnect the external interface of the luffing winch, and complete the debugging.

[0015] The above settings, in the process of the luffing winch driving the steel wire rope to ascend, after the hydraulic oil enters the three-way interface, the shuttle valve can be pushed to make the reversing valve reverse, and then the hydraulic oil of the LEP interface flows through the reversing valve to release the brake of the luffing winch, at the same time, the hydraulic oil passes through the three-way interface in turn to flow through the motor, ball valve three, and then flows back to the multi-way valve group through the LWB interface to form a complete oil circuit, so that whether the control oil circuit can normally drive the luffing winch to rotate can be observed, and by adjusting the one-way speed regulating valve, the hydraulic oil flowing into the shuttle valve through the three-way interface can be blocked by pushing the shuttle valve, so that the hydraulic oil at the brake of the luffing winch flows back to the LT interface of the multi-way valve group through the reversing valve, whether the rotation of the luffing winch gradually slows down to stop can be observed, so as to judge whether the brake oil circuit can normally realize the brake; In the process of testing the luffing winch driving the steel wire rope to descend, whether the brake oil circuit can normally realize the brake is judged.

[0016] Further, the step S1.2 comprises: S1.2.1-S1.2.3,

[0017] S1.2.1 Close the LT interface in the multi-way valve group and ball valve one and ball valve two connected with the LEP interface, open ball valve three, LWA interface, LWB interface and LEP interface, so that the hydraulic oil flows from the LWB interface into the ball valve three, at the same time, the three-way interface is turned on, the hydraulic oil flows into the three-way interface after the motor, then flows to the LWA interface and the shuttle valve respectively, the hydraulic oil pushes the shuttle valve to move left after the single piston rod cylinder, then flows to the reversing valve for reversing, after the reversing, the hydraulic oil flowing from the LEP interface flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released;

[0018] S1.2.2 Change the hydraulic oil flow into the LWB interface by the variable hydraulic pump, then observe whether the reverse rotation speed of the luffing winch changes with the change of the hydraulic oil flow;

[0019] S1.2.3 Close the LEP interface, at the same time, open the LT interface, so that the hydraulic oil flows out from the luffing winch brake, then flows to the LT interface through the reversing valve, enters the multi-way valve group, finally flows back to the oil tank, and observe whether the reverse rotation of the luffing winch gradually slows down to stop.

[0020] The above setting, the hydraulic oil enters from the LWB interface, at the same time, the three-way interface is turned on, so that the hydraulic oil flows back to the LWA interface of the multi-way valve group after flowing through the ball valve three, the motor and the three-way interface, at the same time, the hydraulic oil pushes the shuttle valve after flowing through the three-way interface, so that the reversing valve realizes reversing, and then the hydraulic oil flowing from the LEP interface flows through the reversing valve to release the brake of the luffing winch, driving the luffing winch to rotate reversely, so that the control oil circuit can be observed whether it can normally drive the luffing winch to rotate, and after adjusting the one-way speed regulating valve, the hydraulic oil flowing into the shuttle valve through the three-way interface can be blocked by pushing the shuttle valve, so that the hydraulic oil at the brake of the luffing winch flows back to the LT interface of the multi-way valve group through the reversing valve, whether the rotation of the luffing winch gradually slows down to stop can be observed, so as to judge whether the brake oil circuit can normally realize the brake.

[0021] Further, the step S1.1.2 further includes that the hydraulic oil flowing out from the motor A port flows to the one-way speed regulating valve and the shuttle valve respectively, and flows into the single piston rod cylinder after the one-way speed regulating valve, the single piston rod cylinder is provided with a single piston rod and a reset spring, the reset spring is sleeved on the single piston rod, and the single piston rod is connected with the pawl of the luffing winch.

[0022] The above setting controls the hydraulic oil entering the single piston rod cylinder through the one-way speed regulating valve, so that the pawl connected with the single piston rod cylinder is separated from the ratchet wheel of the luffing winch, when brake failure occurs in the test of the luffing winch brake, the pressure of the single piston rod cylinder can be changed through the one-way speed regulating valve, and then the pawl connected with the single piston rod cylinder drives the ratchet wheel of the luffing winch to realize emergency braking.

[0023] Further, the step S1.1.4 also includes adjusting the one-way speed regulating valve, so that the hydraulic oil pressure connected with the shuttle valve becomes larger, pushing the shuttle valve to move right, and the hydraulic oil flowing out from the luffing winch brake passes through the one-way valve and then flows to the shuttle valve, thereby blocking the connection between the shuttle valve and the three-way interface.

[0024] The above setting can prevent the three-way interface from continuously supplying oil to the reversing valve through the shuttle valve during the process of the luffing winch driving the steel wire rope to rise, thereby making the reversing valve unable to reverse, so that the hydraulic oil of the LEP interface cannot flow to the luffing winch brake through the reversing valve, thereby achieving the luffing winch brake.

[0025] Further, the step S1.2.1 also includes the hydraulic oil flowing back to the multi-way valve group through the LWA interface and finally flowing back to the oil tank.

[0026] The above setting facilitates the recovery of hydraulic oil, so that a complete oil circuit is formed during the process of the luffing winch driving the steel wire rope to descend.

[0027] Further, the step S1.2.1 also includes the hydraulic oil flowing out from the ball valve three-way also flowing to the one-way speed regulating valve and the shuttle valve, and then flowing into the single piston rod cylinder after passing through the one-way speed regulating valve.

[0028] The above setting can achieve emergency braking of the luffing winch through the pawl connected with the single piston rod cylinder when brake failure occurs during the process of the luffing winch driving the steel wire rope to descend.

[0029] Further, the step S1.2.3 also includes adjusting the one-way speed regulating valve, so that the hydraulic oil pressure connected with the shuttle valve becomes larger, pushing the shuttle valve to move right, and the hydraulic oil flowing out from the luffing winch brake passes through the one-way valve and then flows to the shuttle valve, thereby blocking the connection between the shuttle valve and the three-way interface.

[0030] The above setting can prevent the three-way interface from continuously supplying oil to the reversing valve through the shuttle valve during the process of the luffing winch driving the steel wire rope to descend, thereby making the reversing valve unable to reverse, so that the hydraulic oil of the LEP interface cannot flow to the luffing winch brake through the reversing valve, thereby achieving the luffing winch brake. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a hydraulic oil circuit connection diagram of the luffing winch in the present application. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0033] As Figure 1As shown, a test method of a luffing winch of a crane comprises an oil tank 1, a variable hydraulic pump 2, a multi-way valve group 3, an LWA interface, an LWB interface, an LT interface and an LEP interface connected with the multi-way valve group 3 respectively, a reversing valve HDV, a check valve CHV, a three-way interface BO2, a motor BO1 connected with the luffing winch, a ball valve one BV2 / 1, a ball valve two BV2 / 2, a ball valve three BV1, a shuttle valve HSV, a one-way speed regulating valve BO3 and a single piston rod cylinder 4, one end of the ball valve one BV2 / 1 is connected with the LEP interface, one end of the ball valve three BV1 is connected with the LWB interface and the three-way interface BO2 respectively, the other end of the ball valve one BV2 / 1 is connected with one end of the ball valve two BV2 / 2 and the other end of the ball valve three BV1 respectively, the other end of the ball valve two BV2 / 2 is connected with the three-way interface BO2 through an adjustable flow valve NQ1 and an unadjustable flow valve BR1, the other end of the ball valve three BV1 is connected with an A port of the motor BO1, one end of the one-way speed regulating valve BO3 and the shuttle valve HSV respectively, a B port of the motor BO1 is connected with one end of the three-way interface BO2, the other end of the three-way interface BO2 is connected with the LWA interface, a third end of the three-way interface BO2 is connected with the shuttle valve HSV, the shuttle valve HSV is connected with one end of the check valve CHV and the reversing valve HDV respectively, the other end of the check valve CHV and the reversing valve HDV are connected with a brake of the luffing winch, the reversing valve HDV is also connected with the LT interface, the multi-way valve group 3 is connected with the oil tank 1 through the variable hydraulic pump 2, before testing, the luffing winch is set to an empty load state.

[0034] Further comprising the following specific steps:

[0035] S1 Before starting the luffing winch, check the driving valve in the control oil circuit and the brake oil circuit of the luffing winch, and then test the luffing winch driving steel wire rope rising process and the luffing winch driving steel wire rope descending process,

[0036] S1.1 The luffing winch driving steel wire rope rising process comprises S1.1.1-S1.1.4,

[0037] S1.1.1 Close the LT interface in the multi-way valve group, the ball valve one and the ball valve two connected with the LEP interface, open the LWA interface, the LWB interface and the LEP interface, so that the hydraulic oil enters the three-way interface from the LWA interface, flows into the B port of the motor and the shuttle valve after passing through the three-way interface, pushes the shuttle valve to move left after the hydraulic oil, flows to the reversing valve for reversing, and after reversing, the hydraulic oil flowing from the LEP interface flows to the brake of the luffing winch through the reversing valve, so that the brake is released;

[0038] S1.1.2 opens the ball valve three, hydraulic oil flows from the B port of the motor to the A port of the motor, then flows from the LWB interface to the multi-way valve group through the ball valve three, and finally flows back to the oil tank, while the hydraulic oil also flows to the one-way speed regulating valve and the shuttle valve, flows into the single piston rod cylinder through the one-way speed regulating valve, the single piston rod cylinder is provided with a single piston rod and a reset spring, the reset spring is sleeved on the single piston rod, and the single piston rod is connected with the pawl of the luffing winch, so that when brake failure occurs in the process of testing the luffing winch driving the steel wire rope to rise, the pressure of the single piston rod cylinder can be changed through the one-way speed regulating valve, and then the pawl connected with the single piston rod cylinder drives the ratchet wheel of the luffing winch to achieve emergency braking;

[0039] S1.1.3 changes the flow of hydraulic oil entering the LWA interface through the variable hydraulic pump, and then observes whether the rotating speed of the luffing winch changes with the change of the flow of hydraulic oil, in the embodiment, if the flow of hydraulic oil becomes larger, the rotating speed of the luffing winch also becomes larger, if the flow of hydraulic oil becomes smaller, the rotating speed of the luffing winch also becomes smaller, it is judged that the control oil circuit of the luffing winch is normal;

[0040] S1.1.4 closes the LEP interface, opens the LT interface at the same time, and adjusts the one-way speed regulating valve, so that the hydraulic oil pressure connected with the shuttle valve becomes larger, the shuttle valve is pushed to move right, while the hydraulic oil flowing out of the brake of the luffing winch flows to the shuttle valve through the one-way valve, and then blocks the connection between the shuttle valve and the three-way interface, so that the hydraulic oil flowing out of the brake of the luffing winch flows to the LT interface through the reversing valve into the multi-way valve group, and finally flows back to the oil tank, and the rotation of the luffing winch is observed, if the rotation of the luffing winch gradually slows down to stop, it is judged that the brake oil circuit of the luffing winch is normal;

[0041] S1.2 the process of the luffing winch driving the steel wire rope to descend includes S1.2.1-S1.2.3,

[0042] S1.2.1 closes the LT interface in the multi-way valve group and the ball valve one and the ball valve two connected with the LEP interface, opens the ball valve three, the LWA interface, the LWB interface and the LEP interface, so that the hydraulic oil enters the ball valve three from the LWB interface, at the same time, the three-way interface is connected, flows into the three-way interface through the motor, then flows to the LWA interface and the shuttle valve through the three-way interface, the hydraulic oil flows back to the multi-way valve group through the LWA interface, and finally flows back to the oil tank, while the hydraulic oil pushes the shuttle valve to move left after flowing to the reversing valve for reversing, after reversing, the hydraulic oil flowing into the LEP interface flows to the brake of the luffing winch through the reversing valve, so that the brake is loosened, in the embodiment, the hydraulic oil flowing out of the ball valve three also flows to the one-way speed regulating valve and the shuttle valve, flows into the single piston rod cylinder through the one-way speed regulating valve, so that when brake failure occurs in the process of the luffing winch driving the steel wire rope to descend, the pawl connected with the single piston rod cylinder drives the ratchet wheel of the luffing winch to achieve emergency braking;

[0043] S1.2.2 Change the hydraulic oil flow into the LWB interface by the variable hydraulic pump, then observe whether the reverse rotation speed of the luffing winch changes with the change of the hydraulic oil flow, in this embodiment, if the hydraulic oil flow becomes larger, the rotation speed of the luffing winch also becomes larger, if the hydraulic oil flow becomes smaller, the rotation speed of the luffing winch also becomes smaller, then it is judged that the control oil circuit of the luffing winch is normal;

[0044] S1.2.3 Close the LEP interface, and open the LT interface, so that the hydraulic oil flows out from the luffing winch brake, then flows to the LT interface through the reversing valve, enters the multi-way valve group, and finally flows back to the oil tank, and observe the rotation of the luffing winch, if the rotation of the luffing winch gradually slows down to stop, then it is judged that the brake oil circuit of the luffing winch is normal;

[0045] S2 disconnect the external interface of the luffing winch, and complete the debugging.

[0046] The working principle of the present application is: by controlling the on-off and adjusting of the one-way speed regulating valve of the ball valve one, the ball valve three, and the LWA interface, the LWB interface, the LT interface and the LEP interface connected with the multi-way valve group 3, then test whether the control oil circuit of the luffing winch can normally drive the luffing winch to rotate and whether the brake oil circuit can normally realize braking during the process of driving the steel wire rope to rise or descend, so as to ensure that the luffing winch can safely realize efficient operation, and avoid safety accidents in the process of formal operation hoisting.

Claims

1. A testing method for a marine crane, wherein the luffing winch is set to an unloaded state, and all external interfaces of the luffing winch are connected to a multi-way valve group, including LWA, LWB, LT, and LEP interfaces, and the multi-way valve group is connected to an oil tank via a variable displacement hydraulic pump, characterized in that: It also includes the following steps: Before starting the luffing winch, S1 inspects the valves in the control and braking hydraulic circuits of the luffing winch, and then tests the processes of the luffing winch driving the wire rope upward and downward. The S1.1 test of the luffing winch driving the wire rope upward includes S1.1.1 to S1.1.

4. S1.1.1 Close the LT port in the multi-way valve group and ball valve one and ball valve two connected to the LEP port, and open the LWA port, LWB port and LEP port, so that the hydraulic oil enters the three-way port from the LWA port, flows into the motor and shuttle valve respectively after passing through the three-way port, and the hydraulic oil pushes the shuttle valve to the left and flows to the reversing valve for reversing. After reversing, the hydraulic oil flowing in from the LEP port flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released. S1.1.2 Open ball valve three. The hydraulic oil flows through the motor and then through ball valve three back to the multi-way valve group from the LWB interface, and finally flows back to the oil tank. S1.1.3 Change the flow rate of hydraulic oil entering the LWA interface by using a variable hydraulic pump, and then observe whether the speed of the luffing winch changes with the change of hydraulic oil flow rate; S1.1.4 Close the LEP interface and open the LT interface at the same time, so that the hydraulic oil flows out from the luffing winch brake, passes through the reversing valve, flows to the LT interface and enters the multi-way valve group, and finally flows back to the oil tank. Observe whether the rotation of the luffing winch gradually slows down and stops. S1.2 Test of the descent process of the luffing winch driving the wire rope; S2 disconnects the external interface of the luffing winch to complete the commissioning.

2. The method for testing a marine crane according to claim 1, characterized in that: Step S1.2 includes: steps S1.2.1 to S1.2.

3. S1.2.1 Close the LT port in the multi-way valve group and ball valves one and two connected to the LEP port. Open ball valve three, LWA port, LWB port and LEP port, so that hydraulic oil enters ball valve three from LWB port. At the same time, the three-way port is opened. After passing through the motor, the oil flows into the three-way port and then flows to LWA port and shuttle valve respectively. The hydraulic oil pushes the shuttle valve to the left and flows to the reversing valve for reversing. After reversing, the hydraulic oil flowing in from LEP port flows through the reversing valve and then flows to the luffing winch brake, so that the brake is released. S1.2.2 Change the flow rate of hydraulic oil entering the LWB interface by using a variable hydraulic pump, and then observe whether the reverse rotation speed of the luffing winch changes with the change of hydraulic oil flow rate; S1.2.3 Close the LEP interface and open the LT interface at the same time, so that the hydraulic oil flows out from the luffing winch brake, passes through the reversing valve, flows to the LT interface and enters the multi-way valve group, and finally flows back to the oil tank. Observe whether the reverse rotation of the luffing winch gradually slows down until it stops.

3. The method for testing a marine crane according to claim 1, characterized in that: Step S1.1.4 also includes adjusting the one-way speed control valve to increase the hydraulic oil pressure connected to the shuttle valve, pushing the shuttle valve to the right. At the same time, the hydraulic oil flowing out from the luffing winch brake flows to the shuttle valve after passing through the one-way valve, thereby blocking the connection between the shuttle valve and the three-way interface.

4. The method for testing a marine crane according to claim 2, characterized in that: Step S1.2.1 also includes the hydraulic oil flowing back to the multi-way valve group through the LWA interface, and finally flowing back to the oil tank.

5. The method for testing a marine crane according to claim 2, characterized in that: Step S1.2.1 also includes the hydraulic oil flowing out of the ball valve three flowing to the one-way speed control valve and the shuttle valve, and then flowing into the single piston rod cylinder after passing through the one-way speed control valve.

6. The method for testing a marine crane according to claim 2, characterized in that: Step S1.2.3 also includes adjusting the one-way speed control valve to increase the hydraulic oil pressure connected to the shuttle valve, pushing the shuttle valve to the right. At the same time, the hydraulic oil flowing out from the luffing winch brake flows to the shuttle valve after passing through the one-way valve, thereby blocking the connection between the shuttle valve and the three-way interface.

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